Fretlord's Fret OptiX are fiber optically illuminated LED fret board position markers for bass guitar.

Simple peel and stick the fiber optic along the top side binding on guitar or bass up to 24 fret scales with no modifications. Fret Optix's Lithium Coin Cell operated and interchangeable LED color light modules inconspicuously mount behind the headstock.

One LED provides up to 12 points of light across a single fiber optic.

Each high output LED module is powered by (1-2) replaceable lithium coin cell batteries (included) with up to 20 hours of battery life. (Color specific)

How to determine your scale length:
Measure the distance from the fret board side of the nut to the middle of the 12th fret wire. DO NOT include the nut. (This distance in inches x2 equals the scale length of your fret board ) Ex. 17" x 2 =34"